Discharge Initiation in Globus-M2 and KTM Tokamaks Using a Coaxial Plasma Jet Accelerator
Voronin A.V. Goryainov V.Y. Gusev V.K. Minaev V.B. Novokhatskii A.N. Petrov Y.V. Sakharov N.V. Zhilin E.G. Chektybaev B.Z. Sarsembaev E.A. Sadykov A.D. Kusainov A.T.
August 2021Pleiades journals
Plasma Physics Reports
2021#47Issue 8763 - 771 pp.
Abstract: Studies were performed on the possibility of using the coaxial plasma jet accelerator to facilitate breakdown and the plasma current start-up in the Globus-M2 and KTM tokamaks. The results of experiments on the jet injection into the Globus-M2 tokamak with a magnetic field of 0.7 T showed that the discharge current rise began 1–2 ms earlier than it did in experiments using gas puffing and inductive breakdown of the working gas. In this case, the breakdown voltage decreased approximately 2 times. The results of experiments on plasma jet injection through the equatorial diagnostic duct into the KTM tokamak with a magnetic field of 0.9 T showed that the gas breakdown occurred up to 6 ms earlier than the breakdown initiated using the inductive method. In this case, the loop voltage decreases approximately 1.5 times. In almost all shots using the accelerator, the gas breakdown occurred, while in its absence, sometimes the gas breakdown could not be obtained.
discharge formation , plasma accelerator , tokamak , working gas breakdown
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Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russian Federation
Ioffe Fusion Technology Limited, St. Petersburg, 194021, Russian Federation
Institute of Atomic Energy of National Nuclear Center of the Republic of Kazakhstan, Kurchatov, 071100, Kazakhstan
Peter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251, Russian Federation
Ioffe Institute
Ioffe Fusion Technology Limited
Institute of Atomic Energy of National Nuclear Center of the Republic of Kazakhstan
Peter the Great St. Petersburg Polytechnic University
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